Aerospace at UCSD

<p>Hello, I just got accepted to UCSD for the fall quarter and I am happy because this was my first choice. However the only problem is that I applied under Aerospace Engineering and was admitted under Physics. This is because Aerospace is a impacted major and I didn't make the cuts. What I want to know is, from the people who go to UCSD: Do the impacted majors usually empty out? As in do a lot of people drop out of Aerospace after the first engineering course? Other people I have asked said the first class is a 'weeder' class and that about half the students drop out, is this true?
Thanks for the help.</p>